City and State paths
San Jose is represented with both local City paths and California State paths, so unlocked reports can compare where size, setback, and placement rules differ.
California ADU rules · popularity rank #3
San Jose ADU Rules & Requirements
San Jose ADU rules include City and California State paths across detached, attached, garage conversion, conversion, and JADU cases. The structured data preserves source warnings where zoning-table or parcel-specific checks are required.
Based on 18 curated rule paths from official sources. Last reviewed June 2026.
Quick facts
- Popularity rank
- #3 California ADU market
- Rule paths
- 18 curated ADU rule sets
- State detached ADU
- Up to 800 sq ft
- Side / rear setbacks
- 4 ft state baseline
- Minimum unit size
- 150 sq ft
- Primary source
- City of San Jose ADU page
Detached ADU baseline
The state detached ADU path includes 1 ADU, 150 sq ft minimum, up to 800 sq ft, 4 ft side and rear setbacks, and zoning-district front-setback references.
Source warnings remain visible
Where a row depends on zoning-table lookup or parcel-specific constraints, the data keeps the caveat in warnings instead of converting it into a yes/no eligibility claim.
Check these rules against your lot
City rules explain the ceiling. Your parcel determines the practical answer: zoning, lot size, APN, setbacks, overlays, and buildable area.
Check my propertyTop California ADU city rules
San Jose ADU FAQ
No. These pages summarize official city and state rule sources for planning research. Permit approval still depends on parcel geometry, zoning details, overlays, easements, fire access, utilities, and plan-check review.
California ADU law creates statewide minimum paths, while cities keep local standards for many project types. Showing both paths keeps the homeowner from treating a single city rule as the whole answer.
Run an address-specific feasibility check. The report combines official city rules with deterministic GIS and parcel data so the next question becomes what fits on your actual lot.
Source notes
Summaries reflect the official source listed below and the structured ADU rule data collected for HomeFeasible's first launch. Regulations change and individual parcels vary; verify current requirements with the city planning department or run a parcel-specific check before making decisions.
San Jose Accessory Dwelling Units (ADUs)Canonical URL: https://homefeasible.com/city/san-jose/adu